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#!/usr/bin/perl -w                                                    
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...

$depth = glGetIntegerv_p( GL_DEPTH_BITS ) ;
print "Depth After = $depth\n" ;

Depth Before = 2
Depth After = 0

Depth Before = 2
Not a valid parameter to glpOpenWindow: `attributes'
No visual! at /usr/lib/perl5/OpenGL.pm line 6049.

Depth Before = 2
X Error of failed request:  BadValue (integer parameter out of range f
+or operation)
...
  Value in failed request:  0x2b1af80
  Serial number of failed request:  26
  Current serial number in output stream:  28